Ovulating spotting... Should I be worried?

Since AF made her return when DS was 10 months, it's been all over the place. I'm on the mini pill so have wondered if that has something to do with it...

But last week when I got some spotting (a couple of weeks after last AF), I had a look at this iphone app I've got that predicts when you're ovulating and sure enough it was saying I should be then. So it sort of clicked, I must have started getting ovulation spotting, and that is why AF has seemed so all over the place.

So I'm wondering, is it something I should be worried about? Could it be a sign that something is up down there?

I've never had anything like this before having DS and am still breast feeding (not sure if that makes any difference).

Any ideas/thoughts/whatever anyone has would be very much appreciated. I'm a bit nervous about googling and thought you ladies might know a bit more than me about the whole thing. So TIA